Calcite with Barite

Unknown Owner

Colorless prismatic crystals of calcite measuring to 3.0 cm in length on a matrix of white bladed barite crystals. In good condition. Previously from the collection of Wolfgang Henkel. This is brightly fluorescent red under longwave ultraviolet light.The Waldshut mining area, located in the southern Black Forest of Baden-Wuerttemberg, Germany, is historically significant for its production of silver, lead, and barite. Geologically, the deposits consist of hydrothermal veins hosted within the crystalline basement rocks of the region, primarily granites and gneisses. These veins were filled by mineralizing fluids that deposited primary sulfides such as galena and sphalerite, often accompanied by a gangue of barite, fluorite, and quartz. The area is also noted for secondary minerals like pyromorphite and secondary uranium minerals found in localized oxidation zones. Historically, mining activity in the Waldshut district dates back to the medieval period, with significant silver and lead extraction occurring during the 15th and 16th centuries. Industrial-scale mining for barite and fluorite saw a resurgence in the 19th and early 20th centuries, with various shafts in the surrounding valleys operating intermittently until economic conditions and ore depletion led to their general closure by the mid-1900s. Today, many of the old workings are preserved as cultural landmarks or explored by mineral collectors for their classic Central European paragenesis.